Line-spacing mechanism for typewriting machines



Patented Apr. 8, 1924.

UNITED sraras GUSTAV LEIDENROTH, OF KETTG-RUHR, GERMANY. Y

LINESPACING MECHANISEI FOR TYPEVRITINGMACHINES.

Application led April 15, 1921. Serial No. 461,647.

Y 10 all whom t may concern: l

Be it known that I, GUs'rAv LEIDENROTH, residing at Kettwig-Ruhr, Germany, a citizen of the German Republic, have invented a certain new and useful improvement in Line-Spacing Mechanism for Typewriting;

h/ achines, ofwhich the following is a specification.

ing' mechanisms for typewriting machines,

in which there is interposed between the 'Y paper roller and the linel spacing ratchet wheel a clutch which can be'thrown out of operation by a member which is independ-` ent of the line spacingy ratchet wheel, in order to enable the paper roller to4 be also moved independently of said line'spacing ratchet wheel.

The subject matter ofV this invention is a line spacing mechanism of this l hind, inv

which the member which serves to throw the clutch out of operation isfsimultane ously able to move the paper roller independently of the line spacing ratchet wheel.

The invention will be described with reference to the accompanying drawings which show one embodiment of the subject matter of the invention by way of example and in which- Figure 1 is a central longitudinal seo tion of the mechanism, a portion being broken away, and

Figure 2 is a section on the line 2-2 of Figure 1, seen from the left.

The paper roller A is fixed on a hollow shaft C carried in bearings in the frame B of the typewriting machine. Upon the hollow shaft C there is mounted to rotate freely, a line spacing ratchet wheel D which is provided with a milled head Z1 and into the gaps between the teeth of which a locking roller E, mounted on the frame B, is adapted to enter under the action of Y a spring F. The locking roller allows the ratchet wheel D to rotate in either one direction or the other. The ratchet wheel D is connected to the free end'of the hollow shaft C, which is enlarged into a disc 01, and by the said hollow shaft C to: the paper roller A, by a clamping catch, which Vcan` be thrown out of operation. The clamping catch is made double-acting and consists of four balls G and G1, each two of the four balls being controlled by a spring H and lying between the cylindrical inner wall d2 of the ratchet wheel D and an eccentric '.tLted.

' other.

face c2 on the disc c1 (indicated in Figure l by dot and dash lines).

lVhen the parts are in the position shown in the drawing, i. e. the coupling' position, the balls Gand G1 lare clamped under the action of the springs H between the surfaces @Zand (Z2, so that they produce ,a coupling free of play between the ratchet wheel The present invention relates to line spacotherA on one and the same diameter, andl embracing, with a' certain play, by their lateral boundary faces 762, which act as stop faces, screws 'caf fiXedin the disc c1 `(see Figure 2). p sto-ps 7c3, which project so far into the ho-l- The disc K also hasvfour low space between thefaces 02' and d2: that' `,the hallsG and G1 lie in their path, (see particularly Figure l). n

If the paper roller A is to be moved in dependence onthe ratchet wheel D, that is y to say, line by line, the'milled head d1 is ro- In' consequence of the couplingV produced by the clamping catch c2 G Z2 between the ratchet wheel D and thepaperroller A,

vthis latter Jfollows the rotation ofthe milled" head: d1 and is advanced line by line, the locking roller E dropping back again into a gap between two teeth of the ratchet wheel i D after each advance. c

lfl the paper roller A is to be moved independently of the ratchet wheel D, the

milled head l is rotated and this according to requirements in one direction or the During this rotation, which takes place e. g. in the direction of the arrow (see Figure 2) the twoV stops in question, of the four stopsca, first come into contact with the two balls G lying' in their path and force'them out of thelocking position. Cn the further rotation of the milled head C there is mounted to 1 one of the two stop faces 7c? of each recess` k1 comes into contact with the screws c3, and the hollow shaft C, and with it the paper roller A takes now part in the the vrotation of the milled head l while the ratchet l wheel D is prevented from rotating by theV locking roller E. This rotation is not prevented by the two balls G1, which hitherto were still clamped in, as when such rotation takes place the distance apart of the surfaces c2 and Z2 from each other is increased at the points Where the balls G1 lie The paper roller A is noW rotated until it has advanced as it desired. l,When the milled head l is released the state or" the parts shown in the drawing Will be automatically restored by the action of the springs H, as will be seen at once Without further description.

As will result from the above description, only one single member has to be operated for any kind of movement or" the paper roller A.

Claims.

1. In a line-spacing mechanism for type- Writing machines, a platen, a line-spacing ratchet Wheel, a clutch mechanism connecting said ratchet Wheel to said platen and a hand Wheel connected to said clutch for simultaneously disengaging said clutch and rotating said platen independently of said line-Spacing ratchet Wheel.

2. In a line-spacing mechanism for type- Writing machines a platen, a line-spacing ratchet Wheel, a clutch Jfor connecting said ratchet Wheel to said platen and a member operatable independently of said ratchet Wheel and engaging said clutch for throwing the same ont of operation and for rotating said platen.

3. In a line-spacing mechanism the combination With a platen of a line-spacing ratchet Wheel, a clutch mechanism associated With said ratchet Wheel for connecting said ratchet Wheel to said platen, a member secured to said platen and forming an element of said clutch mechanism, tappets carried by said member and means operatable independently of said ratchet Wheel for disengaging said clutch and engaging said tappets for rotating said platen.

4. The combination with a platen of a line-spacing mechanism comprising a ratchet Wheel, a clutch mechanism associated with said ratchet Wheel for operatively connecting the same to said platen, a diskshaped member secured to Said platen and forming an element of said clutch mech'- anism, tappets carried by said disk-shaped member, and means operatively engaging said clutch for disconnecting the same, said means engaging said tappets for rotating said platen independently of said ratchet wheel and springs for returning said clutch disengaging means to its inoperative posi` tion.

5. The combination With a platen o a line-spacing mechanism comprising a holloW ratchet Wheel, a clutch mechanism for connecting said ratchet Wheel to said platen comprising an oval-shaped disk disposed Within said ratchet Wheel and connected to said platen, tappets carried by said disk, a plurality of clutching balls disposed between the periphery of said disk and the inside face of. said 'ratchet Wheel, a second disk-shaped member disposed adjacent said clutch mechanism, said second disk-shaped member being provided with projections adapted to engage said balls and slots for engaging said tappets and means for rotating said second disk whereby said clutching balls will be first moved to an inoperative position and said platen rotated independently of the ratchet Wheel by the engagement of said second disk With the tappets carried by'said first mentioned disk.

The foregoing specification signed at Essen, Germany, this 7 th day of March, 1921. i

GUSTAV LEIDENROTH. 

